Deciphering the Yahoo Messenger Protocol by S. Sircar Open chxt protocol is a joke. Since the challenge to decipher the protocol would be missing. From truly academic perspective for the technically elite this would be the biggest muffin coated with cream cheese. Over the years I have spent incalculable amount of time to study the yahoo messenger protocol.
Deciphering the Yahoo Messenger Protocol by S.
Sircar Open source protocol is a joke. Since the challenge to decipher the protocol would be missing.
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From truly academic perspective for the technically elite this would be the biggest muffin coated with cream cheese. Over the years I have spent incalculable amount of time to study the yahoo messenger protocol. There has been no proper documentation, which brings the challenge to decipher the protocol, and to make things even harder Yahoo is bent on changing things around in every build.
In order to study a protocol one needs basic networking knowledge with access to raw packet data logger tools in order to decipher individual packets and establish an understanding of the protocol. I often wonder who are these people?
To me this sadistic unconscious gets its own back for being repressed occultation and the existence barrier are bowed on proving their chaat to attract people in chat rooms. Whatever the reason might be as long as that makes them happy.
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I have decided to make the meat of yahoo messenger protocol the most recent version YMSG9 available to all my chat peers who are ever curious as to how all these exploits are executed. Regardless this tutorial is for all who want to write their own Yahoo chat client or create their own booter or may be just want to know.
In order to create your own yahoo chat client that will boot people off or be used for talking to people, one has to 9 the background procedures that occur every time you log on to yahoo. There are dedicated servers that yahoo operates and every time you log in it connects you to the rest of the yahoo users. So first lets take a crack in deciphering Procedure.
The text shown in "quotes" are plaintext while text without quotes is a description.
For the purpose of this tutorial we shall use scs. If you are connected to yahoo at that time you should see that port is open and connection is established.
Now we can request the challenge string and session ID. The challenge string is used for encrypting the password while the session ID is sent with every packet. The format for the size is A B where A is the of times will go yahpo the size of the payload and B is the remainder.
Username part should be self-explanatory. The packet returned by the server contains both the challenge string and our session ID.
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The challenge string is found at the end of the packet sandwiched between CO 80 and C0 The session ID is characters 17 to 20 4 characters chatt length, starting at and including character 17 Now we have a string and the session ID we need to encrypt the password. For this you will need a dynamic link library file. I provide those dll's for you to use if you wanted.
Now we need to set our status as Available :- "YMSG" 09 00 00 00 00 00 00 04 00 00 00 0C 00 00 00 00 The server now tells us which of our friends are online and what their status is. Now we can send and receive IM's loneliness chat room any other none chat related messenger packets. Here in this section I will introduce the concept of packet re-creation.
Lets say you have a sniffer that just display raw message exchange from the host to the server and vice-versa. Lets first identify where the packet headers are and where the actual packet data starts. The 59 4D ….
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In red is where the packet date starts. I will tell u when we have the actual packet, count it all and u will get It has 5 spaces, because it can Actualy be that long.
Thats over characters. For now we will deal with stuff under characters long though. Each type of packet has a token to tell Yahoo what your doing.
In this case it tells them were sending a im. Read the document to learn how to get this. The following is the actual packet, if u count the amount of decimal values below u will see why we set the length as Once you understand ywhoo I went about building the actual header I will continue on with the packet.
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What I have shown you is the basic Yahoo header. Now let me explain the data portion of the packet. Yahoo uses this because their server is built to know chr 49 of token 6 is your personal screen name.
If u can see the packet both starts and ends with Chr Chr Every time u send a text value to Yahoo it is surrounded with them. Read above for description of ID's.
I take it from this you have sent it to yourself. AS u can see it is again inclosed with Chr Chr Probly some sort of flag for the IM. The following are also some sort of "flags".
We will break them down into parts, but not explain them since they milwaukee chat rooms never changed. I might even post the source code if I get enough bored as I got today. Jee what am I thinking started writing about messenger protocols. By the way all this was possible with the support of Venky. This document is meant for true academic understanding of network protocols and is not meant to be used as a tool for destructive activities.